roof is 18 years old, should I withdraw my offer, thx!

[Peter Zhang]

hi,
I’m new to the forum. I have a question regarding an offer I made yesterday. I offered to a real estate investment property last night. The owner accepted my offer but they didn't have the property disclosure available when I sent my offer. I just received the property disclosure today. I notice the age of the roof is 18 years old, and no repair or replacement work was done since 1994. I feel like the roof is reaching the end of life. I was under the assumption that the roof doesn't need to replace soon when I offered. So the owner is telling me although the roof is 18 years old but nothing is wrong with it, and they stand firm with the price. From a real estate investment standpoint, should I withdraw my offer due to the potential roof replacement cost? Thanks,
Peter